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Figure 3. Correlations between age (ordinate) and maximum concentration of growth hormone during early sleep (top, left), between age and minimum concentration of cortisol during early sleep (top, right), between age and, respectively, time spent in SWS (bottom, left) and in REM sleep (bottom, right). Correlation between GH maximum and age follows an exponential regression equation. Data are from Kern et al. 1996.

Figure 3. Correlations between age (ordinate) and maximum concentration of growth hormone during
early sleep (top, left), between age and minimum concentration of cortisol during early sleep (top,
right), between age and, respectively, time spent in SWS (bottom, left) and in REM sleep (bottom,
right). Correlation between GH maximum and age follows an exponential regression equation. Data
are from Kern et al. 1996.